I am trying to remove an old cast iron bathtub and have so far been able to loosen and remove two of the slip nuts which connect the overflow and the shoe drain via the access panel behind the tub. My question is whether it would be possible to remove the bathtub w/o having to remove the drain flange since I was able to remove both slip nuts? The drain flange is an old two prong spud that will not turn. Does anyone have any suggestions?